Abstract 749: The impact of multimorbidity on the relationship between breast cancer tumor characteristics and survivorship care experiences among older women: A SEER-CAHPS analysis

Abstract Our study examined the associations between breast cancer tumor characteristics and self-reported survivorship care experiences stratified by multimorbidity among older female breast cancer survivors in the United States. Utilizing the National Cancer Institute’s Surveillance, Epidemiology, and End Results (SEER) program and the Centers for Medicare and Medicaid Services’ Consumer Assessment of Healthcare Providers and Systems (CAHPS) survey data linkage from 2000-2019. Breast cancer (BC) survivors (N=19,017) were aged ≥65 years at CAHPS survey who completed a survey after diagnosis of primary site invasive BC. Adjusted multivariable linear regression models were used to estimate beta (β) and standard error (SE) coefficients of the relationships between tumor characteristics (extent of disease: localized, regional, distant; estrogen receptor [ER] status: ER+, ER-, missing/unknown) and several CAHPS composite and rating outcomes, overall and stratified by multimorbidity (BC only, 2-5 chronic conditions, ≥6 chronic conditions). Women were on average 76.3 years (SD=7.14) of age at survey and 4.65 years (SD=3.51) since BC diagnosis. Most survivors were non-Hispanic white (78.1%), had ≥6 chronic conditions (38.1%), were diagnosed with localized BC (80.5%) and/or ER+ tumors (56.9%). Survivors with regional BC at diagnosis reported significantly higher mean scores on Getting Needed Care (β=1.00, SE=0.46, p=0.03), and with distant BC reported significantly lower mean scores on Physician Communication (β=-1.92, SE=0.92, p=0.03) compared to those with localized BC. When stratified by multimorbidity, survivors with distant stage compared to localized, and with 2-5 chronic conditions reported significantly higher mean scores for Getting Needed Care (β=3.85, SE=1.96, p=0.04), while this association was inverse and not statistically significant (β=-2.72, SE=1.87, p=0.14) among survivors with BC only (p-interaction=0.01). While the overall associations between ER status and the CAHPS outcomes were not statistically significant, we observed significant statistical interactions by multimorbidity for the following association: among survivors with BC only, survivors with ER- tumors reported lower Health Plan Ratings (β=-1.89, SE=0.73, p=0.009) compared to survivors with ER+ tumors, while this association was positive however, marginally statistically significant (β=1.63, SE=0.86, p=0.05) among survivors with ≥6 conditions (p-interaction=0.002). BC survivors who are diagnosed with advanced stage and aggressive tumor phenotypes, such as ER- BC, experience different survivorship care experiences when they are also managing multiple chronic conditions. Remarkably, our results demonstrate that women with distant stage breast cancer and multimorbidity reported higher score on getting the care they need. Citation Format: Kate E. Dibble, Zhengyi Deng, Avonne E. Connor. The impact of multimorbidity on the relationship between breast cancer tumor characteristics and survivorship care experiences among older women: A SEER-CAHPS analysis [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 749.